ROH recently posted an article counting down their Five Greatest Factions in ROH History. The group includes: S.C.U.M., Generation Next, The House of Truth, The Age of the Fall, and at number one, Bullet Club.
Below is the tweet sent out by ROH announcing their Top 5 Greatest Factions in History:
 

ROH 5 Count: Greatest Factions in Ring of Honor History https://t.co/x5tSiBwSFf pic.twitter.com/p7GtV6K15b
— ROH Wrestling (@ringofhonor) December 27, 2017